Hoisting-machine



2'S heets'S heet 1.

INVENTEI R Patented Dec. 14,1880.

N,FETERS. PHDTO-LITNOGRAPHEE WASHINGTON. D. C.

W H LOTZ Hoisting Machine.

(No Modem .WlTNEEEEE (No Model.) 2 Sheets-Sheet 2.

W. VH.-, L0TZ. 'I-I'pis'ti'ng Machine. No. 235,366 Patented Dec. 14,1880.

NVENTEIR UNITED STATES H o i STI N e To all whom it may concern:

Be it known that I, WILLIAM H. LOTZ, of Chicago, in the county of Uookand State of Illinois, have invented a certain new and useful Improvement in Hoisting -Machines, of which the following is a specification;

My invention relates to an improvement upon the hoisting-machine for operating shovels to empty grain-cars and clear malt-floors, upon which I have already applied forLetters Patent, such application having been filed February 20, 1880; and the object I have in view in this improvement is to provide simpler and more efficient means for throwing the hoisting-drum into and out of contact with the paper friction-wheels on the line-shafting, which means will operate with the same certainty, no matter at what point in its revolution the drum may be stopped, and will require very little power to release the lever'and-allow the drum'to drop upon the friction-wheels. The resistance which the operator of the shovel will have to overcome in pulling the shovel back will also be greatly reduced, only sufficient resistance being required to keep the rope taut; and, further, the machine will be more compact in construction and less liable to get out of order.

In my improved machine I also dispense with some objectionable and expensive parts of my former machinevi'z., the drum, rope,

and weight for starting thehoisting-drum and releas'in g the cam-lever, the flexible: connection for throwing the lever and the drum upon which it was wound, the toothed 'wheel for tilting the latch, and the vibrating pawl on the end of the latch.

My invention therein consists in the peculiar devices for pulling the cam-lever and raising the frame in which the hoisting-drum is journaled when a certain length of rope has been wound upon such drum; in the peculiar means for locking the cam-lever and holding the hoisting-drum frame in an elei ated position, and for releasing the-lever when the hoist-rope is slackened; and, further, in the various other combinations of the operative parts, all as fully hereinafter explained, and pointed out by the claims.

In the accompanying drawings, forming a part hereof, Figure 1 is an elevation of ne PATENT OFFICE.

WILLIAM H. L OTZ, OF CHICAGO, ILLINOIS.

-MACH|NE.

SPECIFICATION forming .part of Letters Patent No. 235,366, dated December 14, 1880.

Application filed May 17, 1880. (N 0 model.)

end of the machine, the driving-shaft or lineshafting and the supporting-timbers being in cross-section, and the hoisting-drum being shown as raised from the friction-wheels of the line-shaftin g; Fig. 2, a cross-section of the machine through one of the paper frictionwheels, showing the brake for resisting the reverse movement of the hoisting-drum; Fig. 3, a view similar to Fig. 1 when the drum is dropped upon the friction-wheels; Fig. 4, a

crank-nut and pulling the cam-lever; Fig. 5, a sectional detail view of the upper end of the cam-lever, a small portion of the connecting- I'Od. being turned down to show the universal joint; Fig. 6, a detail view of the connectingrod and end joints; Fig. 7, a cross-section of a part of the swinging frame and the crankhub for locking the latch, showing the connection of such crank-hub with the frame; Fig. 8, a separate side elevation of the latch, the crank-hub being shown in cross-section Fig. 9, a longitudinal vertical section through the center of the machine; and Fig. 10, a sectional plan of the swinging idler-roller and frame.

Like letters denote corresponding parts in all the figures.

Ais the driving-shaft or line-shafting. B B are the timbers which support the-line-shafting. 0 G are the paper friction-wheels upon the line-shafting. D is the swinging frame, pivoted by bolt D to plates secured to one of the timbers B. E is the shaft of the hoistingdrum, turning in boxes secured to the swinging frame. F is the hoisting-drum, having flanges a. and extensions F F forming friction-wheels. b is the rope-guard. G is the hoisting-rope. I is the cam-lever. K K are the cams keyed to shaft I, and d d are the anti-friction rollers upon which said cams rest, all the foregoing parts being constructed and arranged as described in my former application, with the exception of the hoisting-drum shaft E. This shaft is extended only at one end beyond the swinging frame I), and outside ofthisframe the end H of the shaft has a screwthread cut uponit, as shown. Upon this screwthread travels a nut, M, having a crank-arm, c, to which is connected the rod N, extending to the head of the cam-lever I.

detail view of the clamp-nut for turning the I The connecting-rod N is jointed to turn laterally at its ends to transverse sleeves ff, which are held by bolts 0 c in the head of the cam-lever and in the bifurcated end of the crank-arm e.

The sleevesff are free to turn on the bolts 0 a, so that universal joints are formed at the ends of the connecting-rod to allow such rod to follow the movement of the crank-nut on the screw H.

Upon the screw H, between the crank-nut and the frame I), is clamped a nut, 0, which is preferably made in two parts, 9 g, having lugs, and secured together by bolts g passing through such lugs. The nuts on the ends of the bolts 9 can be tightened to securely clamp the nut O in any desired position.

The adjoining faces of the crank'nut and the clamp-nut are provided with shoulders h It, which project the width of one screw-thread and follow the spiral line of the thread, and come in contact the full width of their faces when they meet.

The clamp-nut turns with the drum-shaft, While the crank-nut travels upon such shaft.

When the shovel is drawn back. before slackening the rope to start the machine. the crank-nut and clamp-nut are separated, as shown in Fig. 9. When the machine has been started and the rope is being wound up, the crank-nut and cam-lever are in the position shown in Fig. 3. After a certain length of rope has been wound upon the hoisting-drum the crank-nut will have traveled up to the clampnut, and the shoulders [L h of the two nuts, meeting the crank-nut, will turn for a short distance with the clamp-nut, drawing the camlever inwardly to the position shown in Fig. l, and raising the swinging frame so as to move the drum out of contact with the paper frict-ion-wheels.

When the drum is reversed by the drawing back of the shovel the crank-nut travels back again toward the end of the screw H. By the adjustment of the clamp-nut 0 upon the screw H the amount of rope that the drum will wind up can be regulated or changed, as may be desired. The shoulders h h, by reason of their shape and size, will always meet the full width of their contact-faces, no matter to what extent the position of the clamp-nut may be changed.

The latch P, for locking the cam-leverat its inner point of movement, is of the form more particularly shown in Fig. 8. it is pivoted by a bolt, 0', to the head of the cam-lever, and projects inwardly and incloses the hub Qof'a crank, crank-wheel, or disk, Q, which hub turns upon a stud, It, and is secured thereby to the frame D. The latch P has an opening, I, which incloses the hub Q and limits the movement of the cam-lever, and is provided within this opening I and on the upper side thereof with a sbsulder, m, which drops behind the hub when the cam-lever is drawn inwardly. The shoulder at projects just over the center of the hub Q, and a partial revolution in an upward direction of such hub is sufficient to throw the shoulder oh and release the latch. This movement requires very little power, since it is a rolling motion, and is attended with scarcely any friction.

It is an idler-roller of the length of the ropespool, and journaled loosely in the ends of arms n, which are keyed toa shaft, 0,journaled in bars p connecting the timbersB below the line-shutting. The armsn extend on the other side of the shaft 0 and carry a weight. S, which overbalancesbya small amount the idler-roller and the other parts connected with the shaft 0. The idler-roller travels against the inside of the hoist-rope, and its vertical motion is limited by stops q projecting from one of the timbers B. Above the idler-roller R is a fixed roller, T, secured to arms projectinginwardly from one of the timbers B, and pressing against the outer side of the hoist-rope to give the proper angle of the hoist-rope upon the idlerroller. To the shaft 0 is also secured an arm, r, having a short sleeve, 8, pivoted by a bolt to its outer end. The screw-threaded lower end of a rod, U, passes through this sleeve, and is adjustably held by nuts t turning on such rod both above and below the sleeve. This rod U has a slot, u, in its flattened upper end,which slides on the wrist-pin v ofthe crank Q. The slot u allows a slight vibrating movement of the idler-roller without afl'ecting the crank Q. 7

When the machine is stopped by the meeting of the crank-nut and clamp-nut the latch and cam-lever will be in the position showniu Fig. I, while the idler-roller, the crank Q, and rod U will be in the position shown in Fig. 3. Now the shovel is drawn back by the operator, and the idler-roller follows the hoist-rope to the lowest limit of its movement, drawing the crank down into the position shown in Fig. 1, which represents the machine after the operator has commenced to draw back upon the shovel. When the operator reaches the point he wishes to shovel the grain from he pushes the shovel forward into the grain a short distance. This slackens the hoist-rope and allows the weight 8 to overbalance the idler-roller and to throw such roller to its highest position, at the same time moving the crank Q upwardly and turning the hub Q of the crank suflicient to throw off the shoulder mof the latch, which releases the cam-lever and allows the hoist-drum to drop byits own weight upon the paper friction-wheels. The machine commences to wind up the rope, the parts being in the position shown in Fig. 3.

The mechanism for releasing the latch is very sensitive, and operates with the same certainty, no matter in what position the machine may be when the hoist-rope is slackened, while with the striking teeth and tilting latch heretofore used a much greater power is required to throw the latch when a. tooth stops just over the end of the latch than when the tooth has too some distance to travel before reaching the latch. Consequently, to make the movement certain, a heavyweight had to be used, which the operator was obliged to raise in drawing back the shovel, while in my improved ma chine the resistance of the idler-roller to the unwinding'of the hoist-rope is very little.

In order to maintain a proper tension upon the hoist-rope to keep the idler-roller in its lowest position while the operator isdrawing back the shovel, I provide the machine with a brake-shoe, V, (shown in Fig. 2,) which rests upon one of the friction-surfaces F F of the drum, and is connected by an arm, w, to the rope-guard or to some other part of the swinging frame, such arm being pivotally secured to the rope-guard or other part of the swing ing frame by a bolt. The brake-shoe is sup ported out of contact with the friction-surface when the drum is dropped upon the paper friction-wheels by a rod, W, which is pivoted at its lower end to a plate secured to one of the timbers B, and at its upper end passes through an eye in the arm to, near the brakeshoe, and is screw-threaded to receive adjusting-nuts 00. When the drum is raised from the paper friction-wheels it is brought in contact with the brake-shoe, and when lowered upon the paper friction-wheels drops away from such brake-shoe.

What I claim as my invention is- 1. In a hoisting-machine wherein the hoisting-drum is thrown automatically into and out of contact with friction-wheels on the drivingshaft, the cam-lever connected by a rod'with a crank operated by the drum-shaft, substantially as described and'shown.

2. In an automatic hoisting-machine substantially as described, the hoistingdrum shaft having screw-threaded end, the cranknut traveling on such screw-thread, the camlever connected by arod with such crank-nut, and a clutch secured to and turning with the drum-shaft for giving the crank-nut a partial revolution.

3. In an automatic hoisting-machine substantially as described, the combination, with the screw-threaded end H of the hoisting-drum shaft, of the crank-nut M, connected with the cam-lever, and the nut O, clamped adjustably to the screw-thread, said nuts having clutchteeth or shoulders 71. h, substantially as set forth and shown.

4- In an automatic hoisting-machine substantially as described, an idler-roller traveling against the hoist-rope and controlling the devices for locking the hoisting-drum in an elevated position, substantially as set forth and shown.

5. In an automatic hoisting-machine substantially as described, the latch P, having shoulder m, in combination with the turning hub Q, over which such shoulder catches, substantially as set forth and shown.

6. In an automatic hoisting-machine substantially as described, the combination of the idler-roller running against the hoist-rope with the crank-hub connected with such idlerroller, the latch, and the cam-lever, substantially as set forth and shown.

7. In an automatic hoisting-machine substantially as described, the brake for resisting the reverse movement of the hoistingdrum, substantially as set forth and shown.

8. In an automatic hoisting-machine substantially as described, the brake-shoe pivoted to the swinging frame, in combination with a rod for supporting the brake-shoe out of contact with the hoisting-drum when such hoisting-drum is dropped upon the frictionwheels, substantially as set forth and shown.

WILLIAM H. LOTZ. Witnesses OLIVER W. MARBLE, Rrorn). N. DYER. 

